Quoted
[SIZE=3]Potengi-class, Brazilian Riverine Tanker laid down 1943[/SIZE]
Displacement:
309 t light; 320 t standard; 519 t normal; 679 t full load
Dimensions: Length overall / water x beam x draught
188.30 ft / 180.45 ft x 26.25 ft x 5.91 ft (normal load)
57.39 m / 55.00 m x 8.00 m x 1.80 m
Machinery:
Diesel Internal combustion motors,
Geared drive, 1 shaft, 508 shp / 379 Kw = 12.00 kts
Range 15,500nm at 12.00 kts
Bunker at max displacement = 360 tons
Complement:
53 - 70
Cost:
£0.077 million / $0.306 million
Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 13 tons, 2.5 %
Hull, fittings & equipment: 146 tons, 28.1 %
Fuel, ammunition & stores: 210 tons, 40.5 %
Miscellaneous weights: 150 tons, 28.9 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,458 lbs / 661 Kg = 13.5 x 6 " / 152 mm shells or 1.4 torpedoes
Stability (Unstable if below 1.00): 1.21
Metacentric height 0.9 ft / 0.3 m
Roll period: 11.3 seconds
Steadiness - As gun platform (Average = 50 %): 100 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 2.00
Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
Block coefficient: 0.650
Length to Beam Ratio: 6.88 : 1
'Natural speed' for length: 13.43 kts
Power going to wave formation at top speed: 41 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: 6.56 ft / 2.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 14.76 ft / 4.50 m
- Forecastle (25 %): 13.12 ft / 4.00 m (5.58 ft / 1.70 m aft of break)
- Mid (50 %): 5.58 ft / 1.70 m
- Quarterdeck (15 %): 16.40 ft / 5.00 m (5.58 ft / 1.70 m before break)
- Stern: 16.40 ft / 5.00 m
- Average freeboard: 9.25 ft / 2.82 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 40.9 %
- Above water (accommodation/working, high = better): 71.7 %
Waterplane Area: 3,577 Square feet or 332 Square metres
Displacement factor (Displacement / loading): 295 %
Structure weight / hull surface area: 27 lbs/sq ft or 133 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.93
- Longitudinal: 1.81
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, rides out heavy weather easily
Quoted
Originally posted by BruceDuncan
I recall that Snip has posited a smaller support tanker design. Were any of them actually laid down? If so, the larger vessel is a good match. If not, perhaps more but smaller vessels would be in order. Depends in large measure on fleet doctrine.
Quoted
[SIZE=3]Caboclo-class, Brazilian Coastal Construction and Survey Tender laid down 1943[/SIZE]
Displacement:
400 t light; 411 t standard; 578 t normal; 711 t full load
Dimensions: Length overall / water x beam x draught
137.80 ft / 134.51 ft x 29.53 ft x 8.53 ft (normal load)
42.00 m / 41.00 m x 9.00 m x 2.60 m
Armament:
1 - 0.31" / 7.9 mm guns in single mounts, 0.02lbs / 0.01kg shells, 1943 Model
Machine gun in deck mount
on centreline forward
Weight of broadside 0 lbs / 0 kg
Shells per gun, main battery: 3,000
Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 593 shp / 443 Kw = 12.00 kts
Range 11,000nm at 12.00 kts
Bunker at max displacement = 300 tons
Complement:
58 - 76
Cost:
£0.106 million / $0.423 million
Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 15 tons, 2.7 %
Hull, fittings & equipment: 135 tons, 23.3 %
Fuel, ammunition & stores: 178 tons, 30.8 %
Miscellaneous weights: 250 tons, 43.3 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,047 lbs / 475 Kg = 69,057.7 x 0.3 " / 8 mm shells or 0.9 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 1.0 ft / 0.3 m
Roll period: 12.5 seconds
Steadiness - As gun platform (Average = 50 %): 63 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.81
Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
Block coefficient: 0.597
Length to Beam Ratio: 4.56 : 1
'Natural speed' for length: 11.60 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 13.12 ft / 4.00 m
- Forecastle (20 %): 13.12 ft / 4.00 m (6.56 ft / 2.00 m aft of break)
- Mid (50 %): 6.56 ft / 2.00 m
- Quarterdeck (20 %): 13.12 ft / 4.00 m (6.56 ft / 2.00 m before break)
- Stern: 13.12 ft / 4.00 m
- Average freeboard: 9.19 ft / 2.80 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 56.6 %
- Above water (accommodation/working, high = better): 62.4 %
Waterplane Area: 2,897 Square feet or 269 Square metres
Displacement factor (Displacement / loading): 206 %
Structure weight / hull surface area: 31 lbs/sq ft or 152 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.87
- Longitudinal: 3.43
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
Breakdown of Miscellaneous Weights:
- 20 tons for work crane
- 80 tons for metal/welding and woodworking shop
- 150 tons for cargo
Notes:
- Bunker simmed partially as cargo. Actual range is 2,500nm @ 12 knots.
Quoted
Bahia (ex-Biliran), Brazilian (ex-Philippine) Destroyer Leader & Anti-Aircraft Cruiser (ex-Light Cruiser) laid down 1933 (Engine 1943)
Displacement:
3,160 t light; 3,335 t standard; 3,948 t normal; 4,439 t full load
Dimensions: Length overall / water x beam x draught
439.62 ft / 433.07 ft x 41.01 ft x 17.29 ft (normal load)
134.00 m / 132.00 m x 12.50 m x 5.27 m
Armament:
8 - 4.72" / 120 mm guns (4x2 guns), 52.91lbs / 24.00kg shells, 1942 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
16 - 1.46" / 37.0 mm guns (4x4 guns), 1.55lbs / 0.70kg shells, 1943 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1943 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1943 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
6 - 0.54" / 13.7 mm guns in single mounts, 0.08lbs / 0.04kg shells, 1933 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 463 lbs / 210 kg
Shells per gun, main battery: 350
10 - 21.0" / 533.4 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.57" / 40 mm 433.07 ft / 132.00 m 11.48 ft / 3.50 m
Ends: Unarmoured
Main Belt covers 154 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.59" / 15 mm 1.97" / 50 mm
2nd: 0.59" / 15 mm - -
3rd: 0.59" / 15 mm - -
4th: 0.39" / 10 mm - -
5th: 0.39" / 10 mm - -
- Armour deck: 0.79" / 20 mm, Conning tower: 1.97" / 50 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 48,200 shp / 35,958 Kw = 32.51 kts
Range 10,000nm at 15.00 kts
Bunker at max displacement = 1,104 tons
Complement:
248 - 323
Cost:
£1.576 million / $6.303 million
Distribution of weights at normal displacement:
Armament: 58 tons, 1.5 %
Armour: 495 tons, 12.5 %
- Belts: 290 tons, 7.3 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 24 tons, 0.6 %
- Armour Deck: 171 tons, 4.3 %
- Conning Tower: 11 tons, 0.3 %
Machinery: 1,245 tons, 31.5 %
Hull, fittings & equipment: 1,163 tons, 29.4 %
Fuel, ammunition & stores: 788 tons, 20.0 %
Miscellaneous weights: 200 tons, 5.1 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,469 lbs / 1,120 Kg = 46.8 x 4.7 " / 120 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 1.6 ft / 0.5 m
Roll period: 13.7 seconds
Steadiness - As gun platform (Average = 50 %): 67 %
- Recoil effect (Restricted arc if above 1.00): 0.46
Seaboat quality (Average = 1.00): 1.03
Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.450
Length to Beam Ratio: 10.56 : 1
'Natural speed' for length: 23.79 kts
Power going to wave formation at top speed: 62 %
Trim (Max stability = 0, Max steadiness = 100): 65
Bow angle (Positive = bow angles forward): 16.60 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.98 ft / 6.70 m
- Forecastle (20 %): 15.42 ft / 4.70 m
- Mid (60 %): 15.42 ft / 4.70 m
- Quarterdeck (15 %): 15.42 ft / 4.70 m
- Stern: 15.42 ft / 4.70 m
- Average freeboard: 15.94 ft / 4.86 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 120.7 %
- Above water (accommodation/working, high = better): 85.3 %
Waterplane Area: 11,768 Square feet or 1,093 Square metres
Displacement factor (Displacement / loading): 108 %
Structure weight / hull surface area: 54 lbs/sq ft or 262 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.69
- Longitudinal: 1.62
- Overall: 0.75
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Quoted
[SIZE=3]Paraguassú, Brazilian Motochata Fuvial laid down 1929[/SIZE]
Displacement:
600 t light; 616 t standard; 801 t normal; 949 t full load
Dimensions: Length overall / water x beam x draught
231.39 ft / 229.66 ft x 29.53 ft x 5.91 ft (normal load)
70.53 m / 70.00 m x 9.00 m x 1.80 m
Armament:
1 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1929 Model
Machine gun in deck mount
on centreline forward
Weight of broadside 0 lbs / 0 kg
Shells per gun, main battery: 1,500
Machinery:
Oil fired boilers, simple reciprocating steam engines,
Direct drive, 1 shaft, 650 ihp / 485 Kw = 12.00 kts
Range 7,500nm at 12.00 kts
Bunker at max displacement = 333 tons
Complement:
74 - 97
Cost:
£0.131 million / $0.523 million
Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 83 tons, 10.4 %
Hull, fittings & equipment: 246 tons, 30.8 %
Fuel, ammunition & stores: 201 tons, 25.1 %
Miscellaneous weights: 270 tons, 33.7 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,408 lbs / 639 Kg = 5,768.2 x 0.8 " / 20 mm shells or 0.8 torpedoes
Stability (Unstable if below 1.00): 1.22
Metacentric height 1.2 ft / 0.4 m
Roll period: 11.5 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.36
Hull form characteristics:
Hull has raised quarterdeck
Block coefficient: 0.700
Length to Beam Ratio: 7.78 : 1
'Natural speed' for length: 15.15 kts
Power going to wave formation at top speed: 33 %
Trim (Max stability = 0, Max steadiness = 100): 51
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 9.84 ft / 3.00 m
- Forecastle (10 %): 6.56 ft / 2.00 m
- Mid (50 %): 6.56 ft / 2.00 m
- Quarterdeck (15 %): 16.40 ft / 5.00 m (6.56 ft / 2.00 m before break)
- Stern: 16.40 ft / 5.00 m
- Average freeboard: 8.17 ft / 2.49 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 71.2 %
- Above water (accommodation/working, high = better): 91.2 %
Waterplane Area: 5,399 Square feet or 502 Square metres
Displacement factor (Displacement / loading): 183 %
Structure weight / hull surface area: 34 lbs/sq ft or 166 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.06
- Longitudinal: 0.98
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily
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